linux-kernel - Re: [KVM PATCH v4 1/2] eventfd: export eventfd interfaces for module use

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Date:	Mon, 04 May 2009 22:17:15 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	davidel@...ilserver.org
Subject: Re: [KVM PATCH v4 1/2] eventfd: export eventfd interfaces for	module
 use

Al Viro wrote:
> On Mon, May 04, 2009 at 01:57:45PM -0400, Gregory Haskins wrote:
>   
>> @@ -56,6 +57,7 @@ int eventfd_signal(struct file *file, int n)
>>  
>>  	return n;
>>  }
>> +EXPORT_SYMBOL_GPL(eventfd_signal);
>>     
>
> perhaps, but...
>
>   
>> @@ -197,6 +199,7 @@ struct file *eventfd_fget(int fd)
>>  
>>  	return file;
>>  }
>> +EXPORT_SYMBOL_GPL(eventfd_fget);
>>     
>
> this one looks very odd.  Could you show legitimate users?
>   
Hi Al,

I plan on using this in a similar way as the AIO io_submit function does
today for the next version of the virtual-bus patches.  That is,
userspace allocates an eventfd (in this case, via kvm_irqfd() and the
kernel side code you have been reviewing) and subsequently submits the
fd to a unique virtual-bus instance in the kernel via an ioctl().  This
will ultimately associate the vbus instance dynamically with the kvm
instance in a loosely coupled relationship.  Vbus may be compiled as a
module, thus the export.

-Greg

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